Unified Interior Regions


The Pacific Region has nine USGS Science Centers in California, Nevada, and Hawaii. The Regional Office, headquartered in Sacramento, provides Center oversight and support, facilitates internal and external collaborations, and works to further USGS strategic science directions.

States L2 Landing Page Tabs

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Looking down at the crater where the parking lot used to be.
June 20, 2018

Kīlauea Volcano — Halema`uma`u Parking Lot Gone

View of the southern edge of the growing Halema‘uma‘u crater (middle right) during yesterday's helicopter-assisted work at Kīlauea's summit. The once-popular parking lot (closed since 2008) that provided access to Halema‘uma‘u is no longer—the parking lot fell into the crater this past week as more and more of the Kīlauea Crater floor slides into Halema‘uma‘u. The Crater

A geologist points a thermal camera at a fissure to take a temperature reading
June 20, 2018

Kīlauea Volcano — Temperature Readings

HVO geologist measures 260 degrees C (500 degrees F) along ground cracks near fissure 10 in Leilani Estates. Geologists routinely make temperature measurements to track changes throughout the fissure complex in the lower East Rift Zone.

Aerial view of lava channels
June 20, 2018

Kīlauea Volcano — Lava Channel from Fissure 8

Lava from fissure 8 travels about 13 km (8 mi) to the ocean in an open channel. Lava remains incandescent (glowing orange) throughout its journey. The ocean entry is at upper right.

Close up view of pāhoehoe
June 20, 2018

Kīlauea Volcano — Sluggish Pāhoehoe

Sluggish pāhoehoe briefly spills over a section the levee along the well-established lava channel. Such overflows generally travel short distances measured in

GPS monitoring station on the caldera floor
June 20, 2018

Kīlauea Volcano — GPS Station

A temporary GPS station (with radio telemetry for continuous measurement) was installed this week on the Kīlauea caldera floor to track the ongoing

Geologists at work monitoring Kīlauea's Lower East Rift Zone erupti...
June 20, 2018

Geologists at work monitoring Kīlauea's LERZ eruption

Geologist makes early morning observations of the lava fountain and channelized flow at fissure 8 in Leilani Estates.

Fissure 8 and lava channel from above
June 20, 2018

Kīlauea Volcano — Fissure 8 Aerial

Fissure 8 lava fountains reached as high as about 50 m (164 ft) during the past day. The fountain height varies, often sending a shower of 

View of the lava channel
June 19, 2018

Kīlauea Volcano — Fissure 8 Lava Flow

The northern channel margin of the fissure 8 lava flow. Small hill in the distance is the site of our PGcam. Overflows from the channel can be seen producing shiny black to silver 

Aerial view of lava channel coming from a lava fountain
June 19, 2018

Kīlauea Volcano — Fissure 8 Lava Channel

Fissure 8 cone, lava fountain, and channelized lava flow on the morning overflight - June 19 at about 6:10am HST. The lava channel is very full with many small overflows visible on the channel margins. Overflows are sluggish and move slowly downslope as they build up the levees.

Kīlauea lower East Rift Zone lava flows and fissures, June 19, 1:00...
June 19, 2018

Kīlauea LERZ lava flows and fissures, June 19, 1:00 p.m.

Map as of 1:00 p.m. HST, June 19, 2018. Given the dynamic nature of Kīlauea's lower East Rift Zone eruption, with changing vent locations, fissures starting and stopping, and varying rates of lava effusion, map details shown here are accurate as of the date/time noted. Shaded purple areas indicate lava flows erupted in 1840, 1955, 1960, and 2014-2015.

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HVO logs renewed seismic activity at Lō‘ihi...
June 22, 2017

Since the end of February 2017, HVO seismic analysts have noted a slight uptick in the numbers of earthquakes near Lō‘ihi.

Thermal image shows crack across lava delta...
June 22, 2017

Thermal image shows crack across lava delta

Active surface breakouts continue near the 61g vent...
June 21, 2017

Active surface breakouts continue near the 61g vent

No visible breakouts on the coastal plain...
June 16, 2017

No visible breakouts on the coastal plain

HVO's masked geologist heads north to Alaska...
June 15, 2017

Tim Orr accepted a research geology position at the Alaska Volcano Observatory (AVO) in Anchorage, so he's headed north to Alaska. 

Latest upgrade of seismic stations at Kīlauea summit completed...
June 8, 2017

Field engineers at the USGS Hawaiian Volcano Observatory (HVO) recently completed a multi-year effort to upgrade a subset of seismic stations at the summit of Kīlauea Volcano.

A view of the northern Overlook crater wall, through passing fume. ...
June 4, 2017

Different textures on the surface of the summit lava lake

Tracking the latest moves of Kīlauea and Mauna Loa...
June 1, 2017

On the Island of Hawai‘i, deformation is measured primarily with three techniques: tiltmeters, GPS (Global Positioning System), and InSAR (Interferometric Synthetic Aperture Radar).

This video clip shows HVO geologist Tim Orr sampling lava from an a...
May 31, 2017

Hawaiian Volcano Observatory and Jaggar Museum

Numerous fumaroles are present near the rim of Halema‘uma‘u Crater,...
May 28, 2017

Spattering on summit lava lake and Pele's hair around Halema‘uma‘u

A close up of one of the typical pāhoehoe toes. ...
May 27, 2017

Sluggish breakouts near the base of the pali

Volcanoes, Landslides, and Angry Gods—A Pacific Northwest Connectio...
May 25, 2017

Both volcanoes and landslides are important for landscape evolution in Hawaii and worldwide. In Washington State, an old legend makes the connection between them.